Lamp-socket casing



May 20, 1930.

Fi E.SLJUDE LAMP SOCKET CASING Filed June 17, 1929 INVENTOR. JZaIUZJESZaaP/E) Patented May 20, 1930' PATENT eric-E AHARQLD E. sLADn, or GLEN RIDGE, NEW ,'IE'RSEY'A LAMP-SOCKET cAsrNe Application led .Tune '17,

' This invention relates to an improved form and construction vof one-piece molded lamp socket casing; and this invention hasfor its principal object to provide a' one-piece moldedv lamp socket casing having novel means to form thereon a guard or shade liolde'r groove. n Y

Molded lamp socket vcasi'ngs as heretofore manufactured have been furnished with guard or shade holder grooves formed by spaced continuous annular ribs extending around the exterior surface of the casing body. In some types, the casings have been molded in two parts or halves and thenV assembled and joined together by mechanical fastening means, and in other types, a onepiece casing has been molded byjmeans of a split mold. In the former type the production expense is relatively high since it involves' both assembling costs and the cost of the necessary mechanical fastening devices; and furthermore, owing to the two-piece form, the same do not provide a casing of neat and attractive appearance. In the lat ter type, the molding can only be accomplished by a split mold, and consequently the mold cost is comparatively high while the production per hour is lessened, all of which .A increases the cost of production; and furthermore, owing to the'split cavity of the mold, disguring fins or marks are left on the ex-y posed surfaces of the finished casing which detract from its appearance.

It is the principal object of this invention to provide a novel socket casing which may be molded in one piece so as to provide the desired annular seating groove for the attachment of guards or shade holders, without necessity of employing a. split mold; and to this end the socket casing is designed to provide spaced annular rowsV of separated rib projections, with the projections of one Vrow staggered relative to those of the other row, and whereby the projections of one row will be opposed to the intervening gaps between the projections of the other row. By

reason of such novel construction and arrangementV of elements, the casing may be readily and quickly molded in a piston type mold, wherein the box of the mold and co- 1929. 'semi No.v 3`71,371.

operating piston are provided with inge'rlikemembers adapted to pass each other 'or dove-tail when brought together in mold cavity forming relation; the finger-like members thus serving to form the gaps orV spaces between the desired rib projections of the. finished casing. i The finished socket casing, thus furnished with the annular rows of staggered 'rib -pro'- jections, will possess an annular seatinterl mediate the rows of projections for thel 're'- ception of the clamp-band of a guard yor Y shade holder; and the projections will adelf,

quately serve to prevent lateral displacement of the clamp-band when mounted in said groove. j v

lt will thus be obvious that not Yonly will the cost of production of the casings be re# duced to a minimum, butals'o that the finished' casing will possess ran attractive and distinctive appearance.

y An illustrative embodiment. of the invention is shown in the accompanying drawings, in which f y l l Figure l is a side elevation of the novel socket casing'made according to and embodying the principles 'of this invention, the same showing the clamp-band of a. guard i'n 4at,- tached relation thereto; Figure 2 is a top end view of the novel socket casing; andcFigure 3 is a transverse section of the same, taken on line 3-3 in Figure l, but with the guard removed.y y

Similar 4characters of reference are em'- ployed in the above described views to in# dicate corresponding parts. Y

Referring to said drawings', the reference character 5 indicatesthe body of thesocket casing which is adapted to contain within its lower open end the threaded shell contact and center contact, as commonly provided in suchy structures in the manner familiar to those skilled in the art, andto which/are electrically connected the circuit wires 6 and 7 whicli enter and are molded into or otherwisek re lated to the upper end of the socket'casingl., y

`Integrally,for/med in connection with the lower end portionof the socket casing body 5,`

so as to project from the external surface thereof, 1s a lower annular row of rib projecnii ' tionsfor segments 8', separated one from anof the annular rows thereof is suchthat the Y projections or segments of one row'are ver-l tically aligned or opposed to the gaps of the other by intervening gaps 9. Also integrally formed with the casingbody 5, so as toproject'from the external surface thereof, is an upper annular row of -rib projections or segments 10, separated one .from anotherby intervening gaps 11.` Said annular rows of rib projections `or segments are spaced vertically apart to provide an annular seat 12 the sides of which are defined by said rib projections or segments. The essential relative disposition of the rib-projections or segments otherrow. For'example, as shown in the accompanying drawings, the rib-projections or segments 8A of the lower row are opposed to the gaps 11 of the upper row, and similarly the rib-projections `or segments 10 of the' Y essential staggered relation of those of one row relative to thoseot the otheris maintained. It will also be obvious that the rows of rib projections or segments may be spaced any desired distance apart iny order to provide an annular receiving channel Vor Vgroove of desired width; and, furthermore, that the spaced rows of rib projections or segments .may be located at any desired pointintermediate the upper and lower ends of the` socket casing body.`

In the use ot the novel socket casingot this invention, when it is desired to apply a guard or shade holder thereto, the clamp-band of the latter device (as shown in Figure 1) is engaged in the Vannular seat 12,'` and, when tightened up, is held against displacement in one direction by the rib projections or segr ments 8 and in the'other direction by the rib projections VVor segment-s 10, which respec; tivelyabut opposite sides thereof.-

. It will berunderstood that the socket body embodying the novel features of this invention may be madeof any desiredkind of plastic or othenmaterial capable ot being formed bya molding method. n Y

As many changes could be made in the socket .casing structure herein described and shownin the accompanying drawings without departing from the scope ofthe invention Y as defined in the appended claims, it is intended that all matter'contained in the description or shown in the drawings shall be 'Y interpreted as illustrative and not in a limiting sense;

I claim t Y v 1. In a one-piece socket casing, means to provide an external annular shade holder or guard seat, comprising spaced annular rows of rib projections integral with the casing body, thek rib projections in each row being separated by intervening gaps, and said rib projections Yof one row being Vin aligned oppo- A sition to the gaps in the other row.

2; In a one-piece socket casing, means to` provide an external annular shade holder or Aguard-seat, comprising a plurality of eXteriorly projecting segments integral with said body and disposed in vertically spaced staggered relation one to another.A

3. In a socket casing, a plurality of en.

ternal annularly spaced projections'integral with thecasing, said projectionsbeing ar-V ranged in parallel rows around the casing body, with the proj ect-ions of one row opposa ing the spaces between the projections of the other row, and said rows of projections respectively detlning the upper and lower limit ot a guard or shade holder groove.

In testimony,.that I claim the invention set forth above I have hereunto set my handth'is 14th day of J une, 1929.

HAROLD E. SLADEQv 

